Abstract
A compact axial active magnetic bearing with a function of two-tilt-motion control is fabricated which has a new configuration of magnetic poles. They consist of four cylindrical poles with coils and a single common pole whose opposite plane of the rotor has a permanent magnet to achieve multi-degree-of-freedom zero power control. Modal control is applied because local zero power control may make the whole system unstable when the number of control channels is larger than the number of freedoms of motion to be controlled. In the developed system, a disk-shape rotor is sandwiched between two axial magnetic bearing stators that are operated differentially. Such a configuration makes it possible to rotate the rotor without disturbing the axial motion. The characteristics of the fabricated magnetic bearing system including rotation are studied experimentally.
Highlights
Magnetic suspension generates a force for suspension through magnetic fields
The zero power magnetic suspension system uses a hybrid magnet where a permanent magnet is inserted into the flux path of an electromagnet
The zero power control is applied to space equipment and magnetic suspension carrier systems [12] where the power consumption must be minimized
Summary
Magnetic suspension generates a force for suspension through magnetic fields. There is no contact between the stator and suspended object (floator) so that no mechanical friction and wear is expected in operation, even without lubrication [1]. The rotor is sandwiched between two axial magnetic bearing stators that are operated differentially Such a configuration makes it possible to rotate the rotor without disturbing the axial motion. This is the main deference from the levitation system with. This is the main deference from the possible to rotate the rotor without disturbing the axial motion This is the main deference from the levitation system with a four-pole type electromagnet [14]. Local zero power control for each electromagnet may lead to instability of thelocal whole system when the for number of control channels a four-pole type electromagnet [14].
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